Sliding rail assembly

ABSTRACT

A sliding rail assembly includes an outer rail, a middle rail, and an inner rail that are matched with one another, and a self-locking device matched with the inner rail. The self-locking device includes a fixed block and a sliding block moving with respect to the fixed block, a sliding slot provided for the sliding block to slide is disposed on the fixed block, and a sliding block limiting slot is disposed on the sliding block. A spring extends in the sliding slot, and has one end connected to the bottom of the sliding block, and the other end fastened to the fixed block. A clamping portion and a limiting slot are disposed on the fixed block to match with a sliding block clamping portion- and a sliding block limiting portion disposed on the sliding block.

BACKGROUND OF THE INVENTION

1. Field of Invention

The present invention relates to a sliding rail assembly, and moreparticularly to a sliding rail assembly provided with a self-lockingdevice.

2. Related Art

A sliding rail is a device for implementing relative moving of twoadjacent objects, such as a drawer and a keyboard drawer. Generallyspeaking, sliding rail assemblies use balls to reduce friction, so as toimplement smooth opening and closing; however, in a certain situation,when an object is moved or is affected by an external force, the objectconnected to the sliding rail cannot effectively maintain closed state,and is easily slide to fall or shake, causing potential safety risk.Therefore, a sliding rail device having a self-locking function isproposed, for example, a sliding rail device having a self-lockingfunction disclosed in China patent No. 200820188869.3, in which an innerslot is disposed on an inner rail, a fixed plate is disposed in theinner slot, a groove is disposed on the fixed plate, a hooking block isslidably disposed on the groove, the hooking block is connected to thefixed plate through a spring, a boss is disposed on the hooking block, afastening hole matched with the boss is disposed on the fixed plate, apipe step matched with the boss is also disposed in the groovesimultaneously, and a pipe notch is disposed on a hooking plate. Whenthe boss enters into the boss fastening hole and is clamped by the bossfastening hole pipe, the rail assembly is locked and cannot slidefreely, so that the sliding rail assembly in closed state and the objectconnected thereto can be fixed. However, the disposed boss fasteninghole has limited elasticity, and is easily deformed after beingrepeatedly used, so that the self-locking state is unreliable, therebyaffecting the use of the whole object. At the same time, an error easilyoccurs in matched positioning between the boss and the boss fasteninghole during use, which also affects opening and closing of the object.

SUMMARY OF THE INVENTION

The present invention is directed to overcome the defects of the priorart and provide a sliding rail assembly that is stable and can be usedrepeatedly and reliably for a long time.

In order to implement the above objective, the present invention adoptsthe following technical solution.

The sliding rail assembly includes an outer rail, a middle rail, and aninner rail that are matched with one another, and a self-locking devicemounted in a matched manner, and is characterized in that: theself-locking device includes a fixed block and a sliding block movingrelative to the fixed block, the fixed block is fixed through clampingby mounting limiting blocks at two symmetric portions, at the same time,a sliding slot provided for the sliding block to slide is disposed onthe fixed block, and a sliding block limiting slot is disposed on thesliding block. A spring extends in the sliding slot, and has one endconnected to the bottom of the sliding block, and the other end fastenedto the fixed block. A clamping portion and a limiting slot are disposedon the fixed block, so as to match with a sliding block clamping portionand a sliding block limiting portion disposed on the sliding block. Abuffer is further disposed at the front end of the fixed block.

The clamping portion on the fixed block includes a first clampingportion and a second clamping portion, the first clamping portion andthe second clamping portion are protruded on the surface of the fixedblock, and has a distance there-between slightly greater than the widthof the sliding block clamping portion; a clamping block matched with thesliding block is disposed on the inner rail, and the clamping block isfixed to the inner rail through a clamping block riveting hole.

The fixed block is fixed to a mounting groove through clamping bymounting limiting blocks at two symmetric portions.

A sliding guide slot provided with a slope is disposed between thelimiting slot of the fixed block and the first clamping portion.

The outer rail and middle rail, and the middle rail and inner rail arerespectively connected in a sliding manner through balls disposed in anouter ball slot and an inner ball slot.

Two springs are disposed in parallel.

By means of the technical solution, the present invention has thefollowing beneficial effects:

-   -   the self-locking member may be used repeatedly without        deformation and reliably, and can be locked firmly; when being        moved or being affected by an external force, an object using        the sliding rail can remain stable, safe and reliable.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional schematic view of a sliding rail assemblyaccording to the present invention;

FIG. 1 A is a portion enlarged drawing form FIG. 1.

FIG. 2 is a three-dimensional schematic view of a self-locking device ofa sliding rail assembly according to the present invention;

FIG. 3 is a schematic view of a self-locking device of a sliding railassembly in closed state according to the present invention; and

FIG. 4 is a schematic view of a self-locking device of a sliding railassembly in opening state according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The present invention is further illustrated through accompanyingdrawings.

As shown in FIG. 1 to FIG. 3, a sliding rail assembly according to thepresent invention includes an outer rail 10, a middle rail 20, and aninner rail 30 that are matched with one another, and a self-lockingdevice matched with the inner rail. The self-locking device includes afixed block 40 and a sliding block 50 moving relative to the fixedblock, the fixed block is fixed through clamping by mounting limitingblocks 42 at two symmetric portions, at the same time, a sliding slot 47provided for the sliding block to slide is disposed on the fixed block,and a slide limiting slot 51 is disposed on the sliding block. Springs48 extend in the sliding slot, and each have one end connected to thebottom of the sliding block, and the other end fastened to the fixedblock; the two springs are disposed in parallel, and are fixed in afixed seat through engaging with a spring engagement slot 49. A clampingportion and a limiting slot 43 are disposed on the fixed block, so as tomatch with a sliding block clamping portion 52 and a sliding blocklimiting portion 53 disposed on the sliding block. A buffer 41 isfurther disposed at the front end of the fixed block. After the slidingrail is assembled, the buffer ensures that the fixed block and thesliding block are not damaged when a middle rail of an object is pushedback, thereby having a shock absorption and buffer effect. Specifically,the clamping portion on the fixed block includes a first clampingportion 44 and a second clamping portion 46, the first clamping portionand the second clamping portion are protruded on the surface of thefixed block, and has a distance there-between slightly greater than thewidth of the sliding block clamping portion 52; a sliding guide slot 45provided with a slope is disposed between the limiting slot of the fixedblock and the first clamping portion; in addition, a clamping block 32matched with the sliding block is disposed on the inner rail 30, and theclamping block is fixed to the inner rail through a clamping blockriveting hole 31; the outer rail and middle rail, and the middle railand inner rail are respectively connected in a sliding manner throughballs disposed in an outer ball slot 11 and an inner ball slot 21.

During use, the fixed seat of the self-locking device is riveted to theouter rail through the clamping block 32 with rivets. When a drawer ispulled, the sliding rail is pulled out, that is to say, the inner railassembly is pulled to move, and at this time, the clamping block 32 onthe inner rail assembly is engaged in an engagement slot of the slidingblock 50, the sliding block 50 moves along the sliding slot 46 under thepulling force, and when the spring is at the maximum displacement, thesliding block limiting portion 53 on the sliding block presses againstthe limiting slot on the fixed seat, and at the same time, the slidingblock clamping portion 52 is located between the first clamping portion44 and the second clamping portion 46 of the fixed seat, the slidingblock 50 is locked at the position through fixed engagement; at the sametime, the clamping block 32 on the inner rail leaves the sliding blockengagement slot, and then the inner rail slides freely until the draweris pulled to the maximum extending length of the sliding rail. When thedrawing is closed, that is, the inner rail assembly moves backwardsslowly, the clamping block 32 on the inner rail assembly is firstengaged with the clamping block engagement slot on the sliding block 50,and the sliding block 50 is pushed out of the locking point under asmall pushing force. At the same time, the clamping block 32 on theinner rail assembly is affected by the pulling force of the spring, sothat the sliding block 50 springs back together with the inner rail ofthe sliding rail, thereby achieving the function of automatic locking.When the drawing is pulled open, the sliding block 50 is impacted, andthe sliding block 50 may actively jump from the clamping portion of thefixed seat, so that the sliding block automatically springs back underthe pulling force of the spring, and the self-locking device fails. Atthis time, the inner rail assembly can still be pushed to slide, andwhen the clamping block 32 is pushed to the stop position, that is, theself-locking closed state, of the sliding block 50, and the clampingblock 32 is forcedly pushed to the engagement slot of the sliding block50, the clamping block is engaged, and the self-locking device restoresthe normal function. Because the sliding block 50 and the clamping block32 both have a certain slope at the front end thereof, the sliding block50 and the clamping block 32 are protected from being damaged when theclamping block 32 is forcedly pushed back.

Compared with the prior art, the movement of the sliding block 50 islimited by both the sliding slot 47 of the fixed seat and the slidelimiting slot 51 on the sliding block, the matching with the fixed seatis stable and cannot be easily deformed, and can be locked firmly; whenbeing moved or being affected by an external force, the object using thesliding rail can remain stable, safe and reliable.

What is claimed is:
 1. A sliding rail assembly, comprising an outerrail, a middle rail, and an inner rail that are matched with oneanother, and a self-locking device matched with the inner rail, wherein:the self-locking device comprises a fixed block and a sliding blockmoving relative to the fixed block, a sliding slot provided for thesliding block to slide is disposed on the fixed block, and a slidingblock limiting slot is disposed on the sliding block; a spring extendsin the sliding slot, and has one end connected to the bottom of thesliding block and the other end fastened on the fixed block; a clampingportion and a limiting slot are disposed on the fixed block, so as tomatch with a sliding block clamping portion and a sliding block limitingportion disposed on the sliding block; and a buffer is further disposedat the front end of the fixed block.
 2. The sliding rail assemblyaccording to claim 1, wherein the clamping portion on the fixed blockcomprises a first clamping portion and a second clamping portion, thefirst clamping portion and the second clamping portion are protruded onthe surface of the fixed block, and has a distance there-betweenslightly greater than the width of the sliding block clamping portion52.
 3. The sliding rail assembly according to claim 1, wherein the fixedblock is fixed to a mounting groove through clamping by mountinglimiting blocks at two symmetric portions.
 4. The sliding rail assemblyaccording to claim 1, wherein a clamping block matched with the slidingblock is disposed on the inner rail, and the clamping block is fixed tothe inner rail through a clamping block riveting hole.
 5. The slidingrail assembly according to claim 1, wherein the spring is fixed in afixed seat through engaging with a spring engagement slot.
 6. Thesliding rail assembly according to claim 1, wherein a sliding guide slotprovided slot provided with a slope is disposed between the limitingslot of the fixed block and the first clamping portion.
 7. The slidingrail assembly according to claim 1, wherein the outer rail and middlerail, and the middle rail and inner rail are respectively connected in asliding manner through balls disposed in an outer ball slot and an innerball slot.
 8. The sliding rail assembly according to claim 1, whereintwo springs are disposed in parallel.